3 - Aerodynamic Forces Flashcards
1
Q
What do the 4 NACA digits mean?
A
1 - max camber as % of chord
2 - location of the max camber from the leading edge in tenths of chord
3/4 - max thickness as % of chord
2
Q
What is the zero-lift aoa?
A
aoa which lift is zero
3
Q
What is the line of zero lift?
A
the straight line through an aerofoil, which is parallel to the airflow when the aerofoil points downward and produces no lift
4
Q
What is an infinite and finite wing
A
infinite - very long span or no tip, airflow 2-D (chordwise and vertical)
finite - real wing, airflow 3-D (chordwise, vertical, and span wise)
5
Q
What is the pressure coefficient?
A
Cp = P-Pfs/q
P - local pressure
Pfs - static pressure in free stream
q - dynamic pressure in free stream
6
Q
How do you calculate the Area (S)
A
bc (span x chord)
7
Q
A
